N.H. Rev. Stat. Ann. § 656:43

Any town or city authorizing the use of an electronic ballot counting device for the counting of ballots shall pay the cost of lease or purchase. When such a device is purchased by a town or city, the person from whom such device is purchased shall give to the secretary of state a suitable bond with sufficient sureties to keep such device in good working order for not less than 2 years at the seller's own expense.